Process for the production of a dyestuff.



No Drawing.

TEDQSTATES PATENT OFFICE.

ZENSHIRO SUZUKI, OF LOS ANGELES, CALIFORNIA.

PROCESS FOR THE PRODUCTION OF A DYES'IUFF.

To all whom it may concern:

Be it known that I, Znnsmno SUZUKI, a subject of the Emperor of J a an, residing at Los Angeles, in the county 0 Los Angeles and State of California, have invented a 'new and useful Process for the Production of a Dyestuff, of WlllCh the following is a specification.

My invention relates to the process of the production of dye-stuff, the main object of the invention being to provide an inexpensivc process of producing a dye-stuff of a dark brown color, utilizing rice hulls, which were left as Waste formerly.

In carrying out my invention I first take rice hulls, add suitable caustic alkali to the hulls, and then boil the hulls and caustic alkali together until the hulls are dissolved.

In order to sulfurize said dissolved substance, I add a quantity of sodium sulfid and sulfur, and continue to boil, stirring up constantly, until my new sulfid dye-stuffis produced.

The following is -an illustration as to the carrying out of my invention:

I preferably take one pound of rice hulls, six ounces of caustic soda and gallon of water, and boil together about one hour, until a thick alkali liquid of an organic chemical nature is obtained. To said alkali liquid I next add one sulfid and ten ounces of sulfur, and continue boiling, stirring the mixture well all the Specification of Letters Patent. Application filed October 30,1916. Serial No. 128,648.

pound of Sodium.

Patented Oct. 30, 1917.

while. At first a vapor arises; sulfureted hydrogen a strong viscous lump or mass in the boiler. I continue to heat and stir the mass until the heat is raised to the temperature of about from 150 C. to 180 0., and will by this reduce the mass to a dry mass, reduced to a powder and is a new and useful dye-stuif. 1

' In order to get a different de ree of color I may add at t e beginnin of t e process to said rice hulls, either Ii(!6%) millet bran or buck-wheat hulls, throu h the same steps as described above such desired purpose will be accomplished. The dye-stuff I have obtained is to be used for dyeing cotton goods as ordinary dye-stud is used.

What I claim and desire to secure by Letters Patent of the United States is:

1'. The process of making a sulfur-conand then taining dye consisting essentially in heating rice hulls with water and caustic alkali, adding sulfur and sodium sulfid and continuing the heating until sulfureted hydrogen has I been evolved.

2. The process taining dye consisting essentially in heatin rice hulls with water and caustic alkali, ad

ing sulfur and sodium sulfid and continuing the heating until a dry mass is obtained.

'ZENSHIRO SUZUKI.

gas following it, and there is left 35.

which may be 40 ran, wheat bran, 4

arns and cotton 0 of making a sulfur con- 

